VMS Help RTL Routines, LIB$, LIB$BBSSI, Returns  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    The state of the bit before it was set by LIB$BBSSI: 1 if it was
    previously set, and 0 if it was previously clear.